What is the effect of increasing the wavelength of light on the fringe separatio

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Question: What is the effect of increasing the wavelength of light on the fringe separation in a double-slit experiment?

Options:

Correct Answer: Increases

Solution:

Fringe separation β = λD/d. Increasing λ increases β, hence fringe separation increases.

What is the effect of increasing the wavelength of light on the fringe separation in a double-slit experiment?

What is the effect of increasing the wavelength of light on the fringe separation in a double-slit experiment?

Step 1: Understand the double-slit experiment. It involves shining light through two closely spaced slits to create an interference pattern on a screen.
Step 2: Know the formula for fringe separation (β), which is β = λD/d. Here, λ is the wavelength of light, D is the distance from the slits to the screen, and d is the distance between the slits.
Step 3: Identify what happens when the wavelength (λ) increases. According to the formula, if λ increases, then β (fringe separation) will also increase, assuming D and d remain constant.
Step 4: Conclude that increasing the wavelength of light results in wider spacing between the bright and dark fringes on the screen.

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